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Old Fluke Multimeters

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drtaylor:

--- Quote from: Fungus on August 11, 2017, 06:43:10 pm ---8V output in diode test mode.  :)

--- End quote ---
The diode test range uses a constant current diode (JFET based) to generate 1mA output. It has a 1V to 2V drop. It's connected directly to the battery plus which is why you are seeing 8V open circuit. It will not stay at 8V when loaded. The compliance voltage will also drop as the battery depletes. The diode test is limited to 2Vfs. Even though the 8060 will light most LEDs, if the LED has a Vf of >=2V at 1mA, the 8060 will indicate OL. Most of the older chemistry LEDs are close to 2V at only 1mA. But it will light even a blue/white LED, it just won't show the Vf. It might be an interesting modification to force the 8060 into the 20V range. Then you could do some matching. But I'd also want to provide 10~20mA which is appropriate for all small LEDs.
 

--- Quote from: lowimpedance on August 14, 2017, 03:20:35 am ---Thanks for the pic. ,  the big question is ....... Are there any bodge wires on the bottom side ?.  :D

--- End quote ---
Surprisingly no!


--- Quote from: switcher on August 13, 2017, 09:20:49 pm ---
--- Quote from: drtaylor on August 10, 2017, 04:02:35 am ---My lab is all set up for a production line operation for 15 8060s and one 8062.

--- End quote ---

Would love to see some pics of your production line, Mr. T.


--- End quote ---

Well, I shouldn't have called it a production line, but the attached picture shows a portion of my workbench where I am reworking the 8060s. Each unit has a dedicated box so I wouldn't mix them up (you can see more boxes stacked on some of my instruments). My Pace MBT100 does the hard work. My glass soaking tray on the right holds 3 8060s at a time. Bottles of pure IPA are seen to the right of the covered tray.

I use one of my functional 8060s seen on the left for continuity testing (the 8060A has one of the the fastest stretched continuity functions) to make sure that any found corrosion has not eaten a trace. I also use the 200nS range to track down leakage.

A pile of pulled caps is sitting there (yeah, I'm messy) but I was thinking about checking to see how the caps would read for value and leakage current and other cap parameters just to educate myself on what exactly a 35 year old cap does. The ones that were definitely leaking electrolyte...I know what they'll measure. I'm more interested in what caps with 35 year old electrolyte measure from a unit that was still functional. The new caps are in the Mouser bags.

lowimpedance:
Messy !?! are you sure, that bench looks almost surgical. Nice setup BTW.  :-+.
Maybe some more pics over in the 'Show us your workbench' thread of the rest of bench, (if you want to of course).

Fungus:
I've just been looking at the test points on my meter and it's all weird. I'm sure there's some mistakes in the manual.

Here's what I got (my readings in orange):



First of all, there's no TP1 in the diagram, and two TP8s.

On one of the TP8s I get 2.05V, which doesn't correspond to anything in the list and is a long way from the 3.15V mentioned.

On the other TP8 there's a square wave which switches between 2 and a bit volts (same voltage as the TP8 above?) and 5.3V  at 2.43 Hz (see screenshot).


ModemHead:

--- Quote from: Fungus on August 14, 2017, 01:38:48 pm ---I've just been looking at the test points on my meter and it's all weird. I'm sure there's some mistakes in the manual.

--- End quote ---
The downloadable manual is for the most recent models manufactured, with the RMS converter daughter board.  It seems to be a mix of old and new content.  Attached is a scan of an older hardcopy manual (Rev 3 1/88).  It may clear up some things.

Vdg (TP8) is -3.15V when measured with respect to Vdd (TP1 or TP7).

The slow square on TP6 is a convenient scope trigger for observing the integration/de-integration cycle at U3p17.

helius:

--- Quote from: Fungus on August 14, 2017, 01:38:48 pm ---First of all, there's no TP1 in the diagram, and two TP8s.
--- End quote ---
The one to the right should read TP6 (notice the ordering, left to right: 9, 8, 7, 6)


--- Quote ---On one of the TP8s I get 2.05V, which doesn't correspond to anything in the list and is a long way from the 3.15V mentioned.
--- End quote ---
It says "3.15V ref to VDD". 3.15+2.05=5.20


--- Quote ---On the other TP8 there's a square wave which switches between 2 and a bit volts (same voltage as the TP8 above?) and 5.3V  at 2.43 Hz (see screenshot).
--- End quote ---
That is the TP6 ADC trigger, a square wave as indicated

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